Originally Posted by
Wasabi Tofu
O.K. If you are 55 years old or above, you may apply the following card for extending mile validity to 60 months.
(Accually, not extending. Miles earned before card joining expire in 36 months)
JAL G.G WAON Card.
http://www.jal.co.jp/jalmile/card/GG/ (In Japanese)
And I am too young for that.... I guess conclusion is that for certain age brackets there are card options, under certain conditions, to extend point life time.
If OP falls in to the age buckets, there are options other than the JGC Premier and Diamond way.