I’m pushing 40, fairly new to doing this regularly, and my youngest was 19 earlier this year, in the Philippines mind you. Either she didn’t mind or was a hell of an actress. Most “tourists” over there are 50++. Similar experiences recently in Mexico with a 21 and 23 year old and when paying at front,(massage place) a 60 plus looking guy walked out with the 23 yo I had seen a few days previous and she seemed happy enough. My general preference is 23-33 for the balance of looks, maturity, and attitude. My most regular repeater is 25 and is wary of young men, prefers 50+, and insists that age, looks, and size are trivial compared to respect and hygiene.