<P><B>Welcome in your 70s with a smile—if you can find your teeth, that is</B></P> <p>You may now be bored of the novelty of a free bus pass, hair may be growing in unusual places,and you’ll never make it through the late night feature without nodding off. On the bright side, you can look forward to tearing up the pavement on your own top-of-the-range mobility scooter.