Focus on what matters, age isn't probably the main concern. Maybe a 35yr gap affects the expectations that each founder has in terms of dedication and outcome, but shouldn't you be talking about it anyway independently of the age gap?

My advice is to focus on what matters and forget about age. Is it a good personal fit? Do you have fun working together? Do you have the same expectations? Can you agree on equity share? Do both founders add value?

In brief, just make sure you can be good partners.