You can use SEO quack,mozbar,spyfu,semrush to check your PA,DA,SEO difficulty.

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To check any domain age use who.is online website to Find information on any domain name or website. This site provides DNS,
domain names, name servers, IPs, and many more information of any website.
To check website DA, PA use MOZ
To check website TF, CF use majestic

Several tools are available for that. Spyfu and mozbar can help you.

about Trust flow and Citation Flow, You have to get paid Majestic account, luckily, I often buy group with some guys, Very good choice. Anyway, Da and Pa, you can register Moz account for free

There are many online tools are available for the check such as Moz, Seo Quake, Small Seo tools.

There are so many tools available to check the domain age at free of cost. Domain age checker is available easily on the web.

You can use spyfu and semrush and you can also search on web many tool available easily.

the easy and simple use semrush

I've used this tool a lot:

Bulkseotools-Check-Domain-Age

Doug

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If you ask me, I always check any domain age with the help of Hosterstats and this tool is really helpful. Personally I host all of my domains at hostwinds ssd vps hosting account and must say that their speed is really amazing. I like it. Hope it will help.

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seo quake & who.is is the best tool to check website domain age.....

You can use this tool for check your domain age. semrush

You can go with MOZ the perfect tools for checking the PA, DA age and much more

If you want to check your website domain age, then you can visit whois.domaintools.com. This website will give you full information regarding the Domain age.