Grammar Police - can you please check this...

[Comfysock]

Is it:

A. Someone who has learnt xyz all their life
B. Someone who has learned xyz all their life

'Been learning' sounds better to me

Either. Both are acceptable.

I thought it was always 'learned' not learnt. But I don't think either is very well phrased. I agree with @dementedpixie it should be 'has been learning' because its ongoing, not just past tense.

I should add i have no grammar training that's just my take on it!

I agree that “has been learning” sounds better in that particular sentence.

Google tells me either is correct with learned being more common in the US and learnt in the UK. But I did also find this longer explanation:
“it’s a really interesting question, and I’m afraid there’s no simple answer to this one. Because basically either form is correct. I learned – ed – or I learnt to drive a truck in the army. Either one is correct.
But how can this be? Well, the ed form of the past tense is the regular form - I learned to drive a truck – I learned to cook – and very many past tenses end in this “ed”. And you will find there is a tendency for verbs to become more regular as time goes on. This is a feature of language change. Originally, in British English, everyone would have spelt the past tense of learn with T – I learnt to drive, I learnt to cook, but you’ll find more and more people in the UK now using the ed ending.
The same is true of verbs such as spell – as in I spelt it incorrectly – with a T at the end. But now you’ll find more and more people using - I spelled it incorrectly – with an ed at the end. This is probably due to the influence of American English coming into Britain because in the US the ed is used for learn, for spell, for dream for example - I dreamed it with an ed at the end. And you’ll find that this US spelling is starting to replace the original British spelling in British English.
The main thing to remember is that both of these forms are correct. However, the important thing for you to do is to choose which one you would like to use, and to use that one consistently. So try to avoid mixing the ed and the t endings. Try to use just the one, but it’s up to you to decide which one you want to use.”

Apart from the -ed. -t thing, I'm not quite clear what it means.....

Either spelling is OK but I'd prefer "been learning" too as it sounds like they are still learning.

They are interchangeable. Both are correct, but these days the -ed ending is more popular and the -t ending is starting to be seen as a little archaic.

More context please! Is it written language rather than spoken?
Don't normally start a sentence with someone who has ..

As a person who has practiced ballet for 15 years ....

What is the thing they have learned? Language, dance and cooking?

It's either 'someone who learnt' or 'someone who has been learning'. Different meanings, either past or ongoing.

In terms of learnt or learned, either is correct but learned is more common.

Personally prefer 'learnt' though.

Sorry to be the pedant, but in British English that should be 'practised'.

Oops. That's true. Either menopause brain or I never realised it! Verb is always a s ing.