Yikes, that's a bit harsh coming from a 4-year-old. I'm sure you're still a youthful, vibrant parent despite what the little one says. Kids say the darndest things!
Lol that's messed up. Your kid's just being a little jerk. Don't take it they're just learning to be a human. You're not old, you're a grown-up doin' your best. Keep your head up!