It's more on your comfort level with seeing someone in their 20s or 30s. I have rarely seen nor heard of an upper age limit, but have seen some lower age limits (ie. 21+, 35+).
Age gaps are hot 🌹 No troubles or complaints of what clients in they 60s bring. If anything, it's fun when you can tell how much experience someone has gained in their time - that's a definite positive one could bring 💪 I think I do tend to attract more open-minded clients though because I'm a tattooed noisy little thing on the internet 😜
Similar question asked by another client in his 60s recently:
https://perb.cc/xenforo/threads/whats-in-a-number.380777/