For a non-photographic reply to the OP's question...
The OP says he doesn't carry his wooden legs around as much as he did when he was younger, which suggests he may have a few years on him.
Well, just taking (US) inflation into account, those $900 legs would have cost a bit over $500 in 1990. If you step back to 1980, the cost of the legs would have been around $320. That's the pure inflation outcome (in other words, the reduction in the value of the US dollar. The same is true of, say, a loaf of bread.) There's also a technology consideration: you might not have been able to buy the legs at any price in 1980 or 1990, because the tech has improved, and that usually has a price of its own. It's the same (though a simpler case) as with new cars. People complain at the price of new cars, but a $10,000 car in 1980 would cost more than $28,000 now, purely on account of inflation. But you can't buy a 1980 car now, because the tech has so radically improved, with airbags everywhere, nav systems, seven speed automatic transmissions, hybrids, etc. etc. and that new tech has a price of its own.
I also have a few years on me, and I find it somewhat interesting that when I was born, my parents were paying $1 for things that now cost me $13 and change...Of course, my father, if he hadn't been in the Army at the time, during WWII, would have been making ~$100 a week, the equivalent of about $68,000 a year now.
Here's an inflation rate calculator between any two years, going back a few decades...http://inflationdata.com/Inflation/Inflation_Calculators/Inflation_Rate_Calculator.asp