Change in depression levels due to lockdown in Great Britain 2020, by age

According to the source: "The change in depressive symptoms refers to adults who have experienced a change in depression before and during the pandemic (July 2019 to June 2020). Change in symptoms can refer to any of these four options:
Improvement of depressive symptoms - Refers to someone who had moderate to severe symptoms before the pandemic and no or mild symptoms during the pandemic.
Developed moderate to severe depressive symptoms - Refers to someone who had no or mild symptoms before the pandemic and moderate to severe symptoms during the pandemic.
Continued to experience no or mild depressive symptoms - Refers to someone who had no or mild symptoms before and during the pandemic.
Continued to experience moderate to severe depressive symptoms - Refers to someone who had moderate to severe symptoms before and during the pandemic.