Some people have given some good advice. I not a counellor/pyschologist or even a very great christian and I don't know the answer and only offer my 2 cents worth.
I agree with seeking & having faith in God/Jesus first, and he will heal your fear(s) from past experiences and will findsomeone if that is your heart's desire, though I know it is not easy.
I can understand being worried about growing older and being alone. I am in 40s and always been single and its hard for me to believe God will ever find me someone now, not only because of my age but also because I don't have a job and am in a small country & small "city", etc. (And it seems harder for some men to find someone than it is for women. Alot of women on one hand seem to want someone perfect.)
Why are they angry? What do you mean by "angry"/"anger issues" and dangerous, do you mean violent? (The bible says "be angry and sin not".)
I find it hard to believe that all older men are angry and dangerous, and would turn on you and constantly be angry. There seem to be plenty of good men and marriages out there which don't seem angry/bad (though I don't live with them). And if it was true there would be millions of divorces and men in prison. But some women do seem to have bad luck with men. My mother had bad luck with all 4 husbands.
I guess I myself may be considered to have been or be an angry man at times. But my case is different to most men and is only because I've had and have a rotten hell life. Men are naturally more aggressive/active/physical. And in this bad modern western world regime/system its not surprising some men may be angry. Its not natural to expect humans to be unemotional robots like this regime expects. But the worst I've ever done is make some holes/dents in the wall, and shout. I would never harm/hurt or hit a female or a companion/partner/wife. And if I was ever so lucky for God to find me someone I'd be jolly well grateful and not take her for granted (after having been alone for decades) and try my best to act and treat them right, and always seek to put God/Jesus first. I don't like how most people judge and assume and only see the "negatives" and don't see the positives, and they only blame the indiviudal.
Not everyone who says they are christian are really christian. Christians are not all good and not all perfect. I don't pretend myself to be a very good christian at present.
God should protect you. Plus if you have female friends or family or christian friends you can also get their opinion on the man in addition to your own intuition and experience.
Women often seem to expect men to be mind readers. So maybe pointing out or asking might help. No one knows what we think if we don't say.
A true Christian who has Jesus would "love his wife as Christ loves the church". And "do unto others as would have done to you".
"There is no fear in love; but perfect love casts out fear...." 1 John 4:18.