You can do it by entering into the a player's profile page and then clicking "Compare this player with others" (currently under "New" section).

And you can get something like this there:
https://ratings.fide.com/compare_pl...

However, fide site doesn't support comparing by age, but 2700chess.com does support it:

Click the first player's rating graph, and you can then add another player there (and more than 2 players if you are premium). Then you chose "Filter by age" and set the age range you want to compare.

For example:

He'll be one of the youngest players to do so and the youngest to do so in this modern qualification format which is harder than the means the 2 other younger Candidates of the past used to qualify.

While I agree that Firouzja is probably too inexperienced to go all the way in the next Candidates, 8 more years is exaggerated; Kasparov was 21 when he qualified for a title match, Tal was 22, Karpov was 23. The fact that Karjakin and Caruana were 25 and 24 respectively does not mean Firouzja will necessarily have to wait in my opinion. But in upcoming Candidates he will face opponent-specific preparation on a level he has never experienced before, and this can be tough to cope with. While he has a decent shot at winning (much better than players like Wang Hao or Alekseenko), I would not consider him favourite.

I think wining that FIDE WC was no good for his career. it basically demotivated him, and for a long time not only his ranking but even his rating on the July 2002 list (2743) was his peak. He surpassed it only in September 2010 (2749), eventually reaching his absolute peak of 2764 in September 2011.

He remained a force in World Cups all the way till 2011 though, reaching at least the semifinal in every event but 2007 (2005 final, 2007 quarterfinal, 2009 final 2011 semifinal). He is the prime example that KO is not as much about luck as many think - but also that this format requires somewhat different skills than round robin tournaments (which doesn't mean both can't be strong, see Karjakin). Karjakin, Ding and MVL are other notable KO players.

Its much harder to climb to the top 10 of the FIDE rating list now as a young player than it was 20 years ago. There's a reason there are hardly any teenagers in the top 50 today.

With the rise of chess in Asian countries, the grandmaster Open tournament scene is much more competitive to overcome. Which makes Firouzja's rise all the more impressive.

Firouzja's tournament is already more impressive than anything Ponomariov did in a swiss or round robin format at a similar age and in fact almost rivals Ponomariov's entire career supertournament record after 6 attempts (for Firouzja).

So, Firouzja has played 6 major tournaments so far :

(1) TATA Steel 2020 - at age 16, was leading his first ever supertournament in an event featuring Carlsen, Anand, Caruana as late as round 9 only to falter at the end.

(2) Prague Masters 2020- Won it

(3) Norway chess 2020 2nd place behind #1 Carlsen and ahead of #2 Caruana

(4) TATA Steel 2021 Tied 3rd. Could have tied for 1st if not for some arbiter weirdness. His 'worst' performance since his 1st supertournament a year earlier

(5) Norway Chess 2021 2nd place. Behind #1 Carlsen and ahead of #2 Caruana

(6) Grand Swiss 2021 won it. Ahead of #2 Caruana

That's sustained. I don't believe any young player has shown these results since Carlsen and before that, GK himself. Kramnik did not show such sustained results until he was 19.

Now does that mean that Firouzja is the next Kasparov or Carlsen? You can't actually have a next Kasparov, Carlsen, Karpov or Fischer until the player in question actually DOES it.

<fisayo123: With the rise of chess in Asian countries, the grandmaster Open tournament scene is much more competitive to overcome. Which makes Firouzja's rise all the more impressive>

Indeed, I'll also add that with the technology advances in chess, the competition raised even further. Today, any 2500 rated player and above, can come up with deep engine based preps and cause serious problems to the strongest players.

<fisayo123: Now does that mean that Firouzja is the next Kasparov or Carlsen? You can't actually have a next Kasparov, Carlsen, Karpov or Fischer until the player in question actually DOES it.>

True, but as for Firouzja, it is obvious that the one-in-a-generation-talent is there, and the motivation to improve in chess and succeed is there as well.

There one thing that is unclear to me about him though: Does he have a well supporting team around him, that help him focus on the things that matter most?

I think that he had good training environment in Iran, but its unclear to me how he works since he left there. It took him 2 years just to decide which country to represent, so I don't know.

Carlsen always had the support of his father, and trainers and sponsors that he grouped around him. Kasparov had an excellent soviet team around him, and so did Karpov.

Fischer is the only one who did most of his work alone. But I don't know if we will ever see another Fischer. Also those were were different times.