I just don't know but mine is from the day I got the truck. A 99MY which hasn't had the slightest of faults yet!!I make sure there is enough fluid and yes I made a little adjustment due to some wondering. An adult might turn up pretty soon
IMHO the lower swivel pin can be well tightened due the strong nature of the bearing ( using finger thumb feeling - an adult may correct me soon) but the bearing in the upper pin can easily get knackered so that demands some care.