Walther MPL or Tokyo Marui MPL Airsoft Guns?

Question:

both atleast 20 years old, where can i buy one

Answer:

Do you mean this?

No.22 ワルサーMPL
http://www.amazon.co.jp/gp/product/B0003…
http://item.rakuten.co.jp/yousay-do/4952…

I guess you can buy it from net shopping in Japan.