A leaf ball full of angry old ladies who want to beat you up.
Did you know weaver ants have nursing homes? They are unlike any nursing home you have ever seen. Satellite nests are where older workers move as they near the end of their lives. But, old ants are the opposite of old humans. The older an ant gets, the more risks she will take. So, if the weaver ant territory is under attack the older ants in these satellite nests with rush out aggressively and throw themselves into battle. They aren't worried about taking a few risks. When ants are young they are very shy and cautious. In many species their first jobs are inside of the nest. As they grow older they move to jobs with higher and higher levels of risk.
A new young ant represents a huge investment by the colony: the food and labor it took to grow her from a tiny egg. If she were to die on her first day that's a loss. If she dies after living most of her life, building tunnels, raising more ants, collecting food, it's a gain. So, the oldest ants in the colony are the most bold, and do things like exploring new territory and attacking big powerful intruders (like you! don't mess with weaver ants, they will bite and spray you with acid to make the bite burn)
This is the opposite of humans. Humans are most reckless when we have just become adults. I think the big difference is we live so long that our bodies deteriorate. Worker ants seem to die in their prime, just as agile as the young, but they have memorized the local map. Ants do "learn" as they grow older. And this may be another reason for this pattern. By slowly expanding from the nest ... maybe it keeps young ants from getting lost? IDK And maybe it's a kind of filter, the most robust ants making it to the nursing home to fight.
These differences aren't selective of course. Just saying that an ant who gets killed doing simple tasks near the nest entrance might not be cut out for the "elder army." Even with limited genetics there is a lot of variation in ants due to how the brood is fed, nest conditions.
Imagine if you played loud music by a nursing home and all the old ladies came out and beat you down! (I think carpenter ants might do this "old ant's home of violence" too...hmmm)
Based on chapter 1 of "The Guests of Ants: How Myrmecophiles Interact with Their Hosts" by Hölldobler &. Kwapich where they talk about satellite nests for old weaver ants. Plus my own experience with carpenter ants.