SIDS is a structural strength maintenance requirement. Nothing to do with risk in VFR to IMC ventures. There is a possibility that an aircraft that was not compliant with SIDS that encountered enough turbulence could break up below relevant margins, however if it was SIDS compliant or more importantly structural failure was not an issue, then age has very little to do with anything. VA almost bent the tail off a brand new ATR, nothing to do with age.
I'd hazard a guess that most light aircraft crashes involving high profile people have been weather related, not aircraft mechanical related.