How do I tell my parents how old my boyfriend is?

I wouldn't usually say this but 18 year is just SICK.
Seriously can't you find ANYONE your own age that you like?

Do you realize your going to be dating a guy who's going to be on life support and go around in a wheelchair by the time your 50?

First things first. You're dating an older guy and it's not all that uncommon. Many men in their 40s date women in their 20s and 30s. It's just a fact of life nowadays. Your parents may be surprised by the age gap, they may not be happy about it, but they should be mature enough to understand and realize you're an adult and can decide for yourself who you date or marry or simply have one night stands with (if that's your thing). Basically who you bring home to mom & dad is less their business and more of a courtesy on your part for introducing them before any large events, oh, say, like at your wedding.

As for the fact that you haven't talked to them about him after 4 months bring me to another point. If he was the same age as you would you still be having the same fear of your parents meeting him and would you have waited this long? If waiting 4 months is normal for you then you shouldn't have anything to worry about. If not, then your parents have a valid gripe in that you did hide the relationship from them as parents do have a right to know what's going on with their kids lives. However, once you move out they no longer have any say in the decisions regarding your life. It's a thin line, but it certainly makes a big difference.

You shouldn't be so far along with this guy and haven't even told your parents about him. Okay first of all girlie, 4 months? And now you're engaged? You're just a kid, you need to give this some more time before you talk long-term. And to be honest, I don't think your mom is going to like it, she'll be furious even but you might as well tell her now then later. With each passing day your feelings grow stronger and also it will be harder to take your mothers advice as you "fall in love. " Tell her and keep an open mind with this guy. He's 42 and you've only known him 4 months. There are 18 years that he's surpassed you by so don't make this decision so quickly. Remember, he wears the pants in this relationship not you, you could have been his daughter, don't forget.

If you feel so deep for this guy, why don't just be honest with yourself and your parents. You also have to take some caution with this guy. I have nothing against older men, but from experience, there are some older that solely date younger women just so that they can control them. I mean, he is already 'controlling' the dynamic of the relationship by allowing you to keep him hidden from your parents. How will parents be able to tell you whether or not the man is decent if they haven't met him? Your relationship is not healthy when there are 'secrets' involved. Your man should know this, given his life experience. A man should WANT to meet your parents despite the risk of opposition that may be faced when meeting them.