How can I tell my mother in law to back off?

Simply, say it. But remember to respect her authority as an elderly and human being. Someday, she might be thankful to you for considering that.

You may need to talk to your mother-in-law with your significant other present and explain to your mother-in-law that while sometimes you value her opinion and life experiences the two of you have formed a relationship and the two of you need to make your decisions regarding your life and life choices. Be gentle but firm and explain that you would be glad to take her advice when you ask for it and at any other time she should ask before stepping in.

I certainly reccomend you don't use the words 'Back off.' Haha,but something like 'I respect your opinion and appreciate your input, but this is what has been decided,' or 'I feel like.......when you.....and I need you to......'

Just tell her politely on how you feel and talk to her one on one. Have her understand where your coming from

Just tell her that you need to experience this on your own to get the full experience and that it is your life yin should live it how you want to not how she wants you to

It depends on what the situation is and how you handle it. You should make sure you plan out what you want to say and do it in a calm manner. You shouldn't swear and make sure you get your point across.

it seems to me that you hold resentment towards your mother in law. how would you feel if your husband/wife were to feel this way about your own mother ? try to understand why your mother in law is trying to get so overly involved , try to see her love and care , try to see her in a positive way rather than a negative way ..

Tell her, straight up. Tell her that you feel like your personal time or personal space or whatever it is feels encroached upon by her, and that she needs to tone it down a notch. You could also talk to your significant other about mentioning something to her.

In my experience with family issues, the less "drama," the better. You aren't in a romantic relationship with your mother in law, so in most cases there's no need to justify yourself to her or get into it with her. Decide on a reasonable boundary with your spouse, set that boundary in a calm way, and don't allow her to push it. For example, let's say you were planning a romantic vacation with your spouse and your mother in law was insisting on tagging along and staying in the same hotel, you might say to her "[MIL], while I appreciate your desire to be actively involved in our lives, [spouse] and I are taking this vacation to spend time together as a couple, just the two of us. We won't be spending time with any family members while we are on this trip. If you would like to plan a trip as a family sometime in the future, we would love to figure something out." See? Asserts a clear boundary without being rude. Bracketing the assertion in positive statements at first (We appreciate the thought/We'll go with you some other time) will make it an easier pill to swallow. If she's still pushing boundaries, you can lose the conciliatory bits any subsequent times you have to tell her.

Tell her that you need a little room & that you are the only controller of your life. It may be hard but you need to be straight foward