Herbert Smith Freehills (HSF), DLA Piper and Allen & Overy (A&O) have the lowest proportion of partners over the age of 50, according to a Legal Week research project into the ages of partners at the UK’s ten largest firms by revenue.

Both HSF and the international limited liability partnership (LLP) of DLA Piper have just 22% of partners aged 51 and above, compared to a group-wide average of 27%.