Is life expectancy higher in the 'East' than the 'West'? I did a quick search and it looks to be the opposite with life expectancy being higher in Europe than Asia.
I agree that mindfulness can help us age better psychologically and spiritually. However, Buddhist monks also get old and sick. This includes some of the leading lights of the 'mindfulness professionals' such as Ajahn Chah, and currently Ajahn Sumedho, who is now almost blind.
Mindfulness may have beneficial side effects that make it a useful addition to an overall lifestyle, but this is more about the quality of your engagement and insight into 'how things are' rather than holding back the tides of time.