You cannot able to change it..
When you write: "i agree for.." you agreed that your birthday date is correct and you wouldn't change it..
the only solution for this, it's opening a new account :/
Your birthday is almost certainly linked to your Google profile. Log in to any Google webservice (like Google+) and access your account, then look for a birthday or date of birth option.
Well, I was trying to change my birth year from 1997 to my real one 1987 for about 2 years so I can access 18+ contect. Finally I found solution. In Google+ profile (about > basic info > edit) you can change your birth date to anything that will make your age under 18 (if your age on account is currently <18). So you change it to tomorrow date minus 18 years. It means you change it to date which makes you 18 tomorrow. Then you have to wait 1 day and now you finally 18 on your account and you can change it to whatever you want. Hope this helps.
To change your date of birth on Amazon, go to the Amazon website and sign in to your account. Navigate to "Your Account," then select "Your Account" again and find the "Login & security" settings. From there, you can edit your date of birth. If you encounter any issues, consider contacting Amazon Customer Service for assistance.
how to change the date of birth in my provident fund account
there is no way to change the date of birth on aqw only one way is to make new account sometime they will realse it
To change your date of birth on your Microsoft account, you will need to verify your identity. You can do this by signing in to your account, going to the "Your info" section, and selecting "Edit date of birth." Follow the prompts to verify your identity, which may include providing a government-issued ID or answering security questions. Once your identity is verified, you can update your date of birth on your account.
To change your birth date on Tumblr, log in to your account and go to your dashboard. Click on your profile icon, then select "Edit appearance." Scroll down to "Birthday," where you can modify your birth date. After making the changes, be sure to save your settings to apply them.
If you need to change the date of birth on your account then you will need to contact the Moshi Monsters Customer service team. Their email is helpme@moshimonsters.com.
Birth Dates are not normally something that changes. Some people have found that you can change your Email address and then open a new account for the original Email address with a new birth date although it might not work at every site.
Well you can't really... Make a new account
To change your sign-up birth date on DeviantArt, go to your profile and click on the "Settings" option. Under the "Account" tab, you’ll find the option to edit your birthday. Simply update the date and save your changes. Note that you might have limitations on how frequently you can change this information.
You cannot change your date of birth as it has already happened. However, you might be able to get a fake birth certificate with a different date of birth. But, this is illegal and I strongly advise you not to do this.