My beers just get a brew number written on the crown caps with a permanent marker pen.
My wines are labelled with a reference number, variety, date started (month & year), bottling gravity and abv.
My wines are now numbered with year and brew within that year, so 1101 was the first wine I made in 2011 up to 1127 being the 27th and last wine started in 2011.
1201 was the first started in January 2012, up to 1218 started at the beginning of December.
Anything with a mere two digit consecutive number pre-dates 2011.
So I can get a pretty good idea just from that brew reference of how old my wines are. Bottling date is largely irrelevant but I can find that information in my notes folder.