Domain age is not the only factor that helps the ranking of the domain, there are a lot of things to be considered while starting the SEO work and during the work such as competition of keywords, the level of On-page optimization, and the quality of backlinks you are creating...
If you are starting a new domain and making the website live for the first time, make sure to make the pages live for indexing only when they are completely optimized... First impression is the last impression so when your website is getting indexed on Google, it will be ranked somewhere on google...