you've done it all wrong, bide your time and wait until you are in your 50's
by then you've both got no interest in life, you've got nothing to spend your money on, apart from cute vacations and mopeds/bikes/whatever does it for you, the kids have long gone and even if she does leave you she cant run very fast due to dodgy hips/knees
plus when you get to 50-60 most women start to look like men with that cats arse on their lips and hairy chins so if they do leave its more often than not a blessing.
if she really has left you then that's sad and I hope you can make it good
a moped isn't worth missing out on all that ironing and cooked breakfasts