4 months old

Proof:

Sellers:

http://www.tf2outpost.com/trade/25698975 (b/o 55 keys pure, lower then low end and high end)

http://www.tf2outpost.com/trade/25686811 (b/o 70 keys below high end)

http://www.tf2outpost.com/trade/25816588 (b/o 55 keys pure, same as the first)

http://www.tf2outpost.com/trade/25802461 (70 keys below high end)

Solds:

(no trade) http://backpack.tf/profiles/76561198105733892?time=1429599600 and http://backpack.tf/profiles/76561198105733892?time=1429686000 (sold for a KaW hustlers ~ 25 keys + 2 buds aka 10 keys) So thats 35 keys

http://www.tf2outpost.com/trade/25603074 (sold for 24 keys + a black max clean ~ 26 keys) So thats 50 keys.

http://www.tf2outpost.com/trade/25244793 (could of sold for 24 keys + a bud. Not 100% sure. http://backpack.tf/profiles/76561198073181396?time=1425369600 and http://backpack.tf/profiles/76561198073181396?time=1426143600 ) Buds were 12 keys back then so that would be 36 keys pure.

Outlier:

http://backpack.tf/profiles/76561198158295396?time=1429599600 and http://backpack.tf/profiles/76561198158295396?time=1429686000 May of sold for a planets backwards ballcap + key + gen foppish. But then he also has a burning medic mountain cap for some reason?

Range because of the 2 solds (35 and 50) and i guess the 36 one counts towards the low end a bit but again that one im not 100% sure it did as it was about a 6 day gap.