Dejar solo los 50 registros mas nuevos

[NSD]

Arme esta consulta pero no me resulta :(

Código SQL:

DELETE FROM T1 AS TA WHERE TA.ID>(SELECT TB.ID AS IDA FROM T1 AS TB WHERE TB.Usuario=1 ORDER BY TB.Fecha DESC LIMIT 50,51);
 

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'As TA WHERE TA.ID>(SELECT TB.ID As IDA FROM T1 As TB WHERE TB.Usuario=1 ORDER BY TB.' at line 1

tambien probe:

Código MySQL:

DELETE FROM T1 WHERE Usuario=1 LIMIT 50,4294967295
 

y nada :/
le cambie de todo pero no anda, alguien me hecha un cable?