What about option #4 - Redirect your existing domain to the old domain? I bought an old domain that is 100% relevant to my current domain but currently has with very little content. It did have more content fours years ago. The old domain is 13 years old, pr=3, while my current is 7 months old pr=1 and a decent amount of content. The old domain I purchased was not expired though and I do not know if this makes a difference. What are the pros and cons of option #4? Am I correct to think that option #1 would result in no benefit from the old domain's age value and if so why is it not listed as a con, a MAJOR one. Its hard to believe that a 301 using option 1 would give my existing domain 13 years credit but I'll take it if it does.
Once a domain expires, the registrar will allow around 30 days for the original owner to renew it. This period depends on the registrar and can range from 2 weeks to a whole year. Once this period is over, the domain enters the "Pending Delete" status, during which it cannot be renewed, purchased or modified in any way. Once the Pending delete status is over, the domain is dropped back into the available pool, and can now be purchased by anyone.

Finally, if you were to manually check for drop domains, you have to jump through many hoops. It's a very labor intensive and often confusing process. When you see that a domain name is available, you shouldn’t just stop there. You should also pay attention to how many backlinks it had, how niche-specific the domain is, what kind of websites link to it, did it get signals from social media, and other indicators of quality. If you were to try to look for drop domains manually, it can be a very, very intimidating process. Thankfully, there is an easier solution.
There are a lot of tools online that you can use to grab expired domain lists, but the tools that you can find here is unique because of its features. You will have great daily updated expired domains list with different TLDs that can be valuable for your work. This tools will find you deleted domains on different criterion. You can search by domain name search option and can have some great domains like you find on other websites like Fresh Drop, expired Domain, etc.
Some people might want to skip that because they think that they've already been crawled, which is a possibility and you can apply a manual exclusion to any results you think are going to be returned on Google for your search query. So things like YouTube, you don't want to crawl, then you can add them in there and it will ignore them if they returned in the search results. Okay, so that's yeah! That's pretty much the search setting query settings here. So your search terms go here. You can have as many as you like just enter them in their line separated.
When searching from keyword DHG will take your list of keywords and search each one, the pages will then be crawled to find unique domains to check availability of. The process is relatively simple but very time consuming when done manually or semi automated as was necessary in the past. Luckily now the job can be set and left to work while you do something else.
Thousands of domain names expire every day. The reasons are different. Some owners forgot to renew the domains, some just don't want them anymore or they moved on to other projects. For most people these so called Expired Domains don't have any value. They just see a bunch of Domain Names someone else deleted and move on, but for the people who know about SEO or the value of good Backlinks, Expired Domain Names are money just waiting to get picked up from the street. The only problem is to separate the good ones from the bad ones. That is where ExpiredDomains.net comes into play.