Question of a worried father….

Hello, my son wants to buy a 10 year old Aprilia RS 125 (roughly, because of A1) and has already taken one into consideration. The frame has approx. 30000 km on the hump, the replacement engine approx. 12000 km. The son of a two-wheeled mechanic has installed the engine, as well as other parts. Now my questions: Are 10 years and 30000 km driving performance not too much for the aluminum frame, I think especially about the fatigue and embrittlement of the material aluminum. If you could help me make the decision, I’d like to do a craft job. Thank you very much.