If there is an apparent positive effect of meditation keeping you youthful why are nearly all the premies looking so old? My condolences on your face, I've got grey hair but my face is still a beautifully tanned brownish flesh coloured sort of color.As nearly everyone in their 60's starts to get sick we may not be able to test your hypothesis especially as Elan Vital will never open their secret premie personal details archives hidden deep beneath the Himalayas in a bomb proof shelter to anyone who's ever posted here.
Practising the Knowledge will never do you any harm, except maybe eyeball problems, tinnitus, ear infections, inability to move your tongue, etc.