Patrick - I am only an investor inasmuch as most people who through hard work and good fortune find themselves at a point at which "under the mattress" wont cut it.
I have always tended towards the traditional route of property and gilt edged for the long term although I do chance my arm in commodities futures and options for the short and medium term .
I also like to chance my nether regions with the odd flutter on the AIM in the UK, and have had varying degrees of success with the odd failure. Happy to report that its not been too bad, and if the urge ever took me , I would still be capable of spawning some more offspring.
Back to your original question, if I think back to when I was 21, I would probably been happy on the day with the frivolous, but as time went by, would be grateful for the wiser present.
So why not give him a bit of both, and a bit of "bling bling" for the day, and a small portfolio which contains a few solid longtermers, and some really volatile stocks that will give a reason to watch them and make timely decisions.
oh "snaffled" - Discussing wealth is not necessarily flaunting it. Most people would agree that discussing it is often the key to making or losing it. It all depends on whose advice you take when you are forming an opinion.