I am a coda now in my 80s and live in Melbourne Australia. Learning a new language is reputedly beneficial as we age, for brain and heart. Dictating this note, and I will copy and paste into the BSL app.
I grew up with the equivalent of BSL, but have not used it for least 65 years. I am still very proficient with finger spelling, and practising or using it in a game environment would be an excellent test.
I would like to participate in the BSL fingerspelling game, but unfortunately it does not seem to register for me. I input my name, PeterA and then proceed with the test. I think that my score must be at least 60 for two minutes but it does not record a score stop it may be that it requires registration, but I cannot see where to register my name and personal details.
In my experience, so far as signing is concerned, unless the learner has almost daily access to a signing person for practice then it will be extremely difficult to become proficient or fluent, if at all.