If you old Android device is running slow, maybe it is time to try out Google Go, an app that come with lightweight version of the popular apps like twitter, facebook, Google Lens etc.
Basically you can use most of the same features as the full fledge app. One of the more interesting feature of Google Go is that it can read out webpages. This is definitely a very useful feature for those who have difficulty reading small text on a small screen. It also supports voice search and Google Lens.