Nothing wrong with befriending someone older. Just beware of strategies if he expects more from you, unless as the friendship develops/circumstances change that's what you want too.

You're very lucky to have someone who wants to impart their knowledge and experience. It's often dismissed, as companies employ younger people who don't have these skills. Too many older people then feel devalued and frustrated that they can't pass on these skills.

From my first job in a predominantly male environment, I've always got on better with men than women. Also, with the internet, I've learned far more than ever I could from family members (harsh, but fair comment). I'm a lady plane spotter (passenger not military), so know about unusual interests. Recently invited to write a blog for UK based spotters community, although I've never met any of them.