Are there jazz clubs or nice bars where a contemporary person over 40 could go to hear music or have a cocktail in Lausanne, and not feel out of place?
ozburn,
There appears to be a fairly good selection of nightlife in Lausanne according to a few websites I checked. This is one of them....
http://www.timeout.com/switzerland/bars-and-pubs/bar-lausanne-guide
You'll probably get some good tips by asking the front desk staff at your hotel when you check-in.
Thank you for the website tip.