Good for her. I hope she's having fun and 'meeting' new people. That's something that's important for everyone, no matter their age.
If I'm still with Mr. Harley when I'm 79, he'll be 90. I don't think that's too old at all. Of course I don't think 15-20 years difference either way is too young or old. But that's just me. When I'm old, I'll be happy as long as someone somewhere is interested! : )