My DS nursed until he's 4.5 yrs old, mostly for nap and nighttime sleeping. I, too, was alone with a nursling that old. It didn't bother me or DH though, we knew how much nursing comforted and grounded my DS. We just didn't volunteer this information freely (ie. we didn't go "Hi, nice to meet you. This is our son and BTW, he's still nurses") to other people.
I tandemed for 2 years. My DD is 2 and she's still going strong. She may end up weaning even later than her brother, I'm guessing. I don't mind, I love, love, love BF.
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