I'm 65 and Adsonica is my third startup. My first was in 1978 using data gathered from film processing labs to measure quality. I spent many years at Prime Computer, PictureTel and on my own as a consultant. The main issue is systemic ageism in the venture community - I've seen more eye-rolling and disrespectful behavior than I care to recount. One Junior Partner even suggested that I wouldn't be able to work late at night. Until there are funds to back middle and late-middle age founders we're going to lose a lot of good ideas and inter generational collaboration.