The young or old might need the money short term (buying a first home or retiring) so should perhaps keep risk lower than the middle aged. For long term savings

The young or old might need the money short term (buying a first home or retiring) so should perhaps keep risk lower than the middle aged. For long term savings I’d just go for a diverse portfolio. Stocks and broad/index low/zero cost funds. That might sound boring but it’s that simple. Keep it global to avoid regional downturns. An often overlooked part of diversity in investment is to look at what industries thrive in a poor climate vs a good one, and keep some of both. (For example defense).