if u push it all the time the engine life may be dereased by 20-30000 kM but look at the enjoyment u get. u just need to maintain the car more carefully and genrally earlier than the recommended intervals, plus u would need tyre changes and disc pad and brake shoe replacement early. i once had a cultus offical car but maintained personnally, i needed new disc pads after 25000 km and tyres after 30000km n i used to pushed it a lot. kept it at 4-5000 RPM mostly and touched / passed the red zone regularly
and please dont compare engines with humans very wrong anology cars are meant for our use and enjoyment - we should just maintain it properly and use it to our fullest benefit/ enjoyment, its more like a shoe if u dont use it, ur feet will hurt