Traveling without updating my green card

[immihelp]

I am planning to make a trip out of the US. I received my Permanent
Resident Card back in 1987. I have not updated my card since. Would I
have problems getting back into the country if I don't update my card?

[immihelp]

You should update it.
https://www.immihelp.com/replace-greencard/

[immihelp]

How long does it take to receive the updated card once I have submitted the papper work?

[immihelp]

Timings vary all the time. Check at
http://www.immihelp.com/processing-times/