The most important thing he got is the motivation he has because any player will lose motivation for having good performance time after time when they get older but Ronaldo is a different player with more power and as you said he even doesn't not suffer a bad injury and maybe that's all because of the playing style and file and the training he has in the team, otherwise he could get retired years ago like many other players.
I think it is related to someone's personality. Ronaldo still has a motivation to play with his best because he is a typical person who always wins every competition he joined. He has a winning mentality, he doesn't want to play like an average player. He wants to be the top scorer, he wants to win a trophy, and he wants to create a new record. It is what Ronaldo always thinks in his mind. So, he never lose motivation in his life.
Yep. Ronaldo very rarely get injury because he has a good lifestyle. He also did regular training and never forget to keep his good fitness. Most old players may not really care about his matters, they think they won't play a longer time. But Ronaldo will always think to play as long as possible. That's why he keeps the motivation to keep his physical as well.