Existing ESXI version - 5.5 AND 6.0 upgrade to 6.5

Hi friends,

We have following 2 Vsphere environment,

Existing ESXI version - 5.5 AND 6.0
vCenter version          - vCenter Server 5.5 GA (build 1312298)

                                   - vCenter Server 6.0 Update 1 (build 3018524)

Here are the following licenses,

VMware vSphere 5 Standard Essential plus (unlimited cores per CPU) 4CPU
vCenter Server 5 Essentials -  1 instance

VMware vSphere 6 Standard (unlimited cores per CPU) 4CPU
vCenter Server 6 Standard - 1 instance

Can I update this environment to Vsphere 6.5 with no cost within the support periods?

The existing licenses are for 2 for 6.0 but didn't upgrade the 1 vsphere which is still 5.5 (expired 10-29-2016). Can we upgrade to the 5.5 and 6.0 to

vsphere 6.5 with no cost since we have vmware support until 2-20-2019

Thanks,

Jocelyn