Sell listings/buy orders expiration date ?

[Street]

Does Steam removes them after one year or another amount of time ? I had a tonn of orders and listings and what's interesting here the oldest are still there but bigger part which I placed later has been removed.
Sorry for grammar.

[wuddih]

6 months.

[Street]

Originally posted by wuddih:

6 months.

but why the older listings are still there ?

[Phantom]

Buy orders can also be cancelled automatically for other reasons such as...

https://support.steampowered.com/kb_article.php?ref=6088-UDXM-7214#buyordersperiod

[Street]

Originally posted by Robin3sk:

Buy orders can also be cancelled automatically for other reasons such as...

https://support.steampowered.com/kb_article.php?ref=6088-UDXM-7214#buyordersperiod

:isimoon:

How long do buy orders stay active?
Buy orders may be cancelled by the system at any time including but not limited to the following reasons:

if something about the item changes
if there are any issues with your wallet balance
if there are issues with trying to complete a purchase
if something changes about your Steam Account
if the buy order results in a purchase
You can check on the status of your buy orders at any time by visiting http://steamcommunity.com/market/.

Still nothing on "Expiration". Same goes for sell listings - no info.
Means smth listed above happened ?