I find mine simply aren't wearing out - perhaps I should go off and do some supermarket car park donuts like the rest of you
Most experts recommend changing tyres at 6-8 years regardless of wear. The rubber hardens with age reducing grip and increasing the probability of a blow-out.
The cars only 6 years old - and now on 42k km.
I might check their age this weekend
2010 Aero Supersport | 2017 VW Multivan | 1996 BMW M3 Evo