Modelling is tough but you're probably not going to get told you're "too old" if you're under 25, and some of the other models I've talked to at Candid are in their 50s, especially hand and shoe models, so I don't think you have anything to worry about in regards to age if that really is something you want to pursue.
A bigger issue would be temperament of any pokemon wanting to model with you, they need to be very patient and willing to put up with a lot, most people miss obvious signs of discomfort. This is especially true if you have any dark types, some people will think they'll steal stuff if you take your eyes off them, which is stressful for the pokemon, I usually try keeping them entertained with coin tricks when I have the chance, so they can relax and others worry less.
@erik-candidinternational
"Too old" is one of the nicer things I've been told but whatever. At least I don't have any dark types.