Even a quality photo couldn’t tell you about someone character. I once read that a person eyes (yes their 2 little eyes) could tell you a lot about their intellectual and personality qualities. This could explain why people wear sunglasses in their profiles.
I wouldn’t put a lot of stock into someone’s Linkedin profile, it’s a good starting point. But in some cases profiles can be a bit exaggerated. Its best to keep your expectations about someone balanced until you meet them.
This may sound old school, but after you exonerated your examination of someone Linkedin profile, its best to just use common sense, could be your best tool. If you have any doubts its best to just move on.
As far as age ago, I think once you’re in your 40’s, weather you have a superior Linkedin profile or not, you better have a good network of ex co-workers and ex bosses that liked you because those could be your best source for future employment. A good recruiter also helps.